I have a Craftsman LT2000 (917.273752) Lawn Tractor. Recently the deck belt ripped. I replaced the belt w/a new 1/2" 95 1/2" belt that's what the owners manual called for. Once installed the belt feels very tight even when the manual pto is disengaged. I try to start the engine but it won't even turn over. I take the belt off and the engine starts w/out any issues. What is causing this? Is it possible that the belt that is shown in the manual is not the correct size? I am puzzled. Can someone please help. Thank you much